eyeshade vs visor

eyeshade and visor both are nouns.

Word	Noun	Adjective	Verb	Adverb
eyeshade	Yes	No	No	No
visor	Yes	No	No	No

As nouns, eyeshade and visor are synonyms defined as:

Other synonyms of eyeshade include bill, peak, vizor.

eyeshade (noun)	visor (noun)
a brim that projects to the front to shade the eyes	a brim that projects to the front to shade the eyes
	a piece of armor plate (with eye slits) fixed or hinged to a medieval helmet to protect the face